Coarse-grinding wheel



' edge of the' pocket and in the path of the jz xdvanc1ng grmchng surfaqe of the r1nqQ Fux-thermore, the storage act1on of t he.

po'ckefs i5 suificiexit 130 pe1mit t lie use Of the wheel upon blocks of less diaxfieter than the wheel, ;1s the p0ckets in a p'ortion of the wheel leaving the work retain the abrasive so ihabthis p'rtion 0f t'he wheel innnediately 1esumesi ts grinding operation as soon as 1t agmn engages die sto'ne. 'W1th the p1'a1-n 11Ot obtain, as ehe abra'sive was, merely swept 0fi' the edge of the stone whenever 21' por-t1on n" ';he wheelpassed beyond the edge thereof.

Ha.ving thus described my invent-ion and. the advantages thereof, lt W111 be v1dent that changes and n'1odificat-ions can be made ther ein by' t-hose skilled in the art within the spirit and scope': of my invention as set forth in the claims, und I du not wish to be' other-' w ise liinited to the detail's herein disclosed bnt what I claim is:- l. A cou1se grinding wheel comprising a pluralit r of concentri'c, rings each having a Series 0 pockets in its inne: side and bottom 'face, said pockets being inclined upwardly and forwardly and eac h ha"ving a. substantially constfint area of delivery opening throughout its length "m the plane of the grfnding surface;

2. A course grinding wheel com 31ising a driving head having a central f ee openwg, and 21 plurali't'y ofrings and integral radiating arms fofn1ed a s a separate unit detachably sebuiedfo sziid head und driven inner sides zind bottom fa.ces to receive and rsto're abrasive as th6 wheel is rotzlted and said z'xrnds' being c1o'sely adjacent and equally spaced.

ELROY ALBERT CHASE. 

